5SR Steel 12-7-2023
Ventilation Any Room or space containing an appliance should have permanent ventilation opening of free
area of 550mm sq per kw of rated output but in no case less than 6500mm sq where air permeability is
greater than 5.0m3, or 6500mmsq +550mmsq per kw of rated output above 5 Kw where the air permeability
is less than 5.0m3. "Note: If there is another appliance using air fitted in the same or adjacent room, it will
be necessary to provide an additional air supply." Ref Building Reg’s Document J
There must not be an extractor fan fitted in the same room as the stove as this can cause the stove to emit
fumes into the room.
4.0 Installation Information
4.1 Chimney
The chimney height and the position of the chimney terminal should conform to Building Regulations. Flue
heights should be high enough to ensure sufficient draught to clear the products of combustion. Check that
the chimney is in good condition, dry, free from cracks and obstructions. The diameter of the flue should not
be less than 125mm and not more than 200mm. If any of these requirements are not met, the chimney should
be lined by a suitable method. The chimney must be swept before connection to the stove.
Where the chimney is believed to have previously served an open fire installation, it is possible that the
higher flue gas temperature from the stove may loosen deposits that were previously firmly adhered, with
the consequent risk of flue blockage. It is therefore recommended that the chimney be swept a second time
within a month of regular use after installation.
If you have any doubts about the suitability of your chimney, consult your local dealer/stockist or chimney
specialist. If there is no existing chimney then either a solid fuel compatible prefabricated block chimney or
a twin-walled insulated stainless steel flue to BS 1856-1 can be used. These chimneys must be fitted in
accordance with the manufacturer’s instructions and also please refer to the current issues of British
Standards BS EN 15287-1:2007 for design, installation and commissioning of chimneys.
4.2 Flue Draught
A flue draught of minimum 1.2mm to a maximum 2.5mm water gauge (12 to 25 Pascals) is required for
satisfactory appliance performance. The flue draught should be checked under fire at high output and, if it
exceeds the recommended maximum, a draught stabiliser must be fitted so that the rate of burning can be
controlled to prevent over-firing.
4.3 Connection to the Chimney
This appliance is not suitable for use in a shared flue. This appliance requires a direct flue connection to the
spigot. If practical, an existing fireplace opening can be bricked up or sealed with a register plate and a short
length of flue pipe of a minimum 125mm internal diameter may then be used to connect the stove to the
register plate in the chimney. This flue pipe should conform to Building Regulations ensure that the pipe end
is no closer than 76mm to the side or rear chimney walls.
If necessary, a hole must be opened up into the flue way above the fireplace in order to fit the appliance to
the flue correctly. Please consult HETAS recommended fitting methods if in doubt. It is essential that all
connections between the stove and chimney-flue are sealed and made airtight with sealing rope, clamping
rings and/or fire cement or heat resisting cement where required.
Both the chimney and flue pipe must be accessible for cleaning and if ANY parts of the chimney cannot be
reached through the stove (with baffle removed), a soot door must be fitted in a suitable position to enable
this to be done.
